Grinder



Nov. 14, 1933. H. O. MUNN 1,935,328

GRINDER Filed Dec. 16, 1929 3 Sheets-Sheet l INVENTOH Henry G. Mz/nn.

ATTORNEYS.

GRINDER is, 1929 3 Sheets-Sheet 2 I v WM Nov. 14; 1933..

v k n A INVENTOF? Henry Q.v Mz/nn TTORNEY5.

Nov. 14, 1933. Q U 1,935,328

GRINDER Filed Dec. 16, 1929 3 Sheets-Sheet 3 INVENTOR Henry Q. M7/7777.

BY k1 gm flaw w AT RNEYS.

UNITED STATES PATENT OFFICE.

GRINDER Henry Q. Mann, Walkerville, Ontario, Canada, assignor to Du-MoreTap and Tool Company, a corporation of Michigan Application December 16,1929 Serial No. 414,267

4' Claims. (01. 125-11) This invention relates to wheel dressing or agrinding machine having a supporting frame trimming devices for grindingmachines. 6, a work supporting table 7, a grinding wheel The mainobjects of this invention are to pro- 8 journaled on a verticallymovable grinding head vide an improved wheel dressing device which, 9 isshown, provided with my improved wheel when once set in properco-operative relationdressing device mounted above the grinding head. 60

ship with respect to a grinding wheel, will at each The wheel dressingdevice is mounted on a frame and any relatively small arbitraryadvancement 10 vertically movable on guides 11 and 12 of the of thewheel relative to the work, followed by grinding wheel frame 6, andsecurable in adthe operation of dressing the wheel, maintain the justedpositions by studs 13 and nuts 14 threaded 10 dressed form of the wheelat that point where thereon. 65 it contacts with the work at a fixedpredeter- The frame 10 has an integrally formed outmined distancerelative to the work support; to wardly projecting wing 15, one face ofwhich is provide a grinding wheel dressing device which provided withvertically disposed guideways 16 will be automatically moved relative tothe cenand 17 rigidly mounted in spaced parallel relater of the wheel anamount proportional to the tion. The inner faces of the guides 16 and1'! 70 relative bodily movement of the wheel relative are grooved toreceive spherical ball bearings 18 to the work support; and to providean improved and 19, which are interposed between said guides, mountingand actuating mechanism for the and a similar pair of guides 20 and 21respectivegrinding wheel dressing elements. 1y, which are rigidlymounted on a back plate 22.

20 An illustrative embodiment ofthis invention is The back plate andguides thereon, together 75 shown in the accompanying drawings, inwhich: with the hereinafter described mechanism Fig..1 is a view inperspective of a grinding 'mounted thereon, forms a verticallyreciprocable machine equipped withmyimproved wheel dresscarriage whichis bodily movable toward and ing device. away from the grinding wheel 8.The plate 22,

Fig. 2 is an enlarged horizontal sectional view at its inner verticalmarginal edge, has a pair of go of the grinding machine taken just abovethe sleeve members 23 and 24 secured thereto which wheel dressingdevice, and showing the dressing surround a vertically disposed rod 25.The device in top plan view. sleeves are split lengthwise and havesuitable Fig. 3 is an enlarged view in front elevation of bossesintegrally formed thereon, which are suitthe improved wheel dressingdevice. ably drilled and tapped to receive screws 26 and Fig. 4 is aview in end elevation of the same. 27 respectively, for clamping thesleeves to the Fig. 5 is afragmentary bottom plan view showrod 25 whentightened up. The plate 22 caring the lever which moves the wheeldressing ries on the front face thereof a pair of superdevice. posedguide frame plates 28 and 29 which are 35 Fig. 6 is a sectional viewtaken on line 6-6 pivoted on a pin 30 which passes through the of Fig. 3looking in the direction indicated by plates 28 and 29, and has itsinner end mounted the arrows. in the back plate 22. A series of headedstuds i 7 is a top D1811 w Of t o p i g 31, 32, 33 and 34 pass throughholes in the plates guide bars showing the anti-friction elements in- 28and 29 and thread into the back plate 22 for 40 terposed therebetween.securing the frame plates to the back plate. The

Fig. 8 is a view in side elevation of the same holes through the frameplates 28 and 29 are with a portion thereof broken away to more slightlylarger than the shanks of the studs 31 to clearly show the interiorconstruction. 34 inclusive, so that the frame plates may be Fig. 9 is anenlarged sectional view taken on shifted slightly relatively to eachother, and to 5 the line 9-9 of Fig. 3 looking in the direction the backplate. indicated by the arrows. Means are provided for accuratelymeasuring Fi 10 is an la d s t onal view taken the relative positions ofthe plates to deteron the line 10-10 f Fi 3 l king in the direcminetheir angularity with respect to each other tion indicated by thearrows. and to the back plate, and comprise a stud 35 50 Fig. 11 is adiagrammatic sketch illustrating mounted in the back plate 22 invertical alignthe application of the invention where the trimment withthe pivot pin 30, and outwardly proming device moves in a directionrelative to the jecting studs 36 and 37 mounted on the frame wheeldifferent from that shown in the previous plates 28 and 29 respectively.figures. The adjacent faces of the frame plates 28 and 55 In theconstruction shown in the drawings. 29 are provided with grooves 38 and39 respeco tivelypwhich form guideways for a pair of bars 40 and 41respectively, which are axially slidable therein, and which serve assupporting members for a pair of diamond-point wheel dressing elements42 and 43 respectively.

The guideways 38 and 39 extend transversely with respect to each other,and converge in a downward direction, and are offset in vertical planeso that the bars 40 and 41 cross each other at their lower ends. Thuswhen the bars are moved downwardly in their guideways the wheel dressingelements 42 and 43 travel in diverging paths.

The frame plates 28 and 29 adjacent the guideways therein are providedwith apertures within which are housed friction elements, which bearagainst the bars 40 and 41 to frictionally retain them in set position.These frictional elements each comprise a helical spring 44, one end ofwhich bears against a threaded plug screwed into the outer end of theaperture and the other end of which bears against and urges a frictiondisc 45 against its bar.

Means are provided for moving the bars 40 and' 41 simultaneously intheir guideways and comprise a pair of links 46 and 4'7, each of whichhas one end pivotally attached to their respective bars, and the otherend pivoted to a fan-shaped arm 48. The arm 48 is secured to a shaft 49rotatably mounted in an outstanding boss 50 integrally formed on theouter face of the plate 29. A handle 51 is secured by means of a setscrew 52 to the shaft 49, so that said shaft may be manually rotated bymovement of the handle.

Means are provided for adjusting the back plate 22, and the assemblycarried thereon, relatively to the shaft 25 and. comprise a-knurled knob53 secured by set screw 54 to a sleeve 55. The sleeve 55 is interiorlythreaded so as to screw on the upper end of the rod 25, said rod beingthreaded to receive the same. The upper end of the sleeve 23 isexteriorly threaded to receive an interiorly threaded sleeve 56, theupper end of which is provided with an inwardly extending annular flange57. The flange 57 engages and retains a bearing washer 58 interposedbetween said ilange and the top end of the sleeve 23.

Means are provided for moving the back plate 22, and assembly carriedthereon, vertically on the guideways 16 and 17 in proportion to themovement of the grinding head 9 relatively to its work, and comprise alever 59 which has one end pivotally mounted in a block 75 slidablehorizontally between the opposed faces 76 of the bracket 60 secured tothe grinding machine frame 6, and the other end pivotally and slidablysecured to the shaft 25. The middle point of the lever 59 is providedwith an aperture to receive a pivot pin 61, which is mounted through theends of a yoke 63, the shank of which is threaded into the grinding head9, and adjustably secured by a lock nut 64.

The connection between the lever 59 and shaft 25 comprises a slidingblock 65 pivotally mounted on a pin 66, which passes through the ends ofa yoke 67 provided at that end of the lever 59. The yoke 67 embracesopposite ends of the block 65 and the block 65, in turn, has its upperand lower sides embraced between the bifurcated ends of a bracket 68,which is rigidly secured on the reduced lower end of shaft 25 by a nut69. The nut 69 clamps the bracket 68 against the shoulder formed by thereduction of size of the lower end of the shaft 25.

In the operation and use of this device, the sleeves 23 and 24 areloosened on the shaft 25 by unscrewing the clamping members 26 and 2'1,and the plate 22 vertically adjusted relatively to the grinding wheel 8by rotating the knurled knob 53 in the proper direction. Graduations maybe provided on this knob for aiding in the proper adjustment thereof.The clamping members 26 and 27 are then tightened, thus securing thesleeves rigidly to the shaft 25.

As the grinding head 9 is moved relatively to the work supported on thetable 7, the plate 22, and assembly carried thereon, is moved verticallyon guideways 16 and 17 through the medium of the lever 59 and yoke 63;the arrangement being such that the wheel dressing assembly device willbe moved twice the distance travelled by the grinding head due to themultiplication secured through the lever 59.

The face of the grinding wheel 8 is dressed by the diamond-pointelements 42 and 43 by movement of the handle 51, which, through the linkconnections 46 and 4'7, slide the bars 40 and 41 axially in theirguideways. The angle of the bars 40 and 41, with respect to each otherand with respect to the face of the grinding wheel 8, may be adjustedwithin certain limits by loosening the studs 31 to 34, inclusive, andshifting the frame plates pivotally about the pin 30. By measuring thedistance from the stud 35 to the studs 36 and 37, carried by the plates28 and 29 respectively, the exact positioning of the wheel dressingelements may be accurately determined.

Due to the lower ends of the bars 40 and 41 being crossed over eachother, it will be apparent that downward movement of the bars will causetheir lower ends to travel in diverging pathways and thus dress the faceof the wheel from its outer sharp edge downwardly toward the body of thewheel, as otherwise a reverse movement of the wheel dressing elementswould chip ofi and injure the fine edge of the wheel. v

The dressing device may, of course, be designed to move in a plane atany angle from 0 to 90 or more degrees relative to the line of movementof the wheel simply by modifying the shape of the arm or lever 59. Sucha change in the relative direction of movement of the trimming devicemight be necessary in case of an auxiliary dressing or trimming device,or for any other reason. It may be thus understood that the particularcase shown is but one particular embodiment of the broad invention.

The above may be illustrated by reference to the diagram in Fig. 11 inwhich the line A-B represents the line of movement of the wheel C whichcorresponds with the wheel 8. The lever D, corresponding to the lever59, is pivoted at E, corresponding to the pivot point 61-of the lever59, and which is fixed relative to the center of the wheel C. The end Fof the lever D is engaged by the surfaces G, corresponding to thebracket 60, which are fixed relative to the frame of the machine, andthe other end of the lever D is pivotally connected at H, correspondingto the pin 66, to the movable fixture J which carries the dressingelements for the wheel C, and which ismovable, relative to the wheelalong the line K-L. The angle lVI between the lines A--B and K-L must,of course, equal the angle of deflection N of the lever D from astraight line. In all cases the distance which the dresser moves inrelation to the wheel must equal the actual movement of the wheel.

Although but one specific embodiment of this invention has been hereinshown and described, it

will be understood that numerous details of the construction shown maybe altered or omitted without departing from the spirit of thisinvention as defined by the following claims.

What I claim is:

1. In a grinding machine, in combination, a bodily movable grindingwheel, a bodily movable trimming device, both of which are independentlysupported on a member, and a bar pivotally supported on one end,pivotally connected to said device on the other end and linked to saidwheel support medially of said pivotsfor eflecting Proportionate butunequal simultaneous bodily movements when the wheel is bodily moved.

2. In a grinding machine, in combination, a bodily movable grindingwheel, a bodily movable trimming device, both of which are independentlysupported on a member, and a lever system operatively connecting saidwheel and device for moving said device relative to said wheel inproportion to and a greater amount than the movement of said grindingwheel relative to the work.

3. In a grinding machine, the combination with ,a support, a grindingwheel supported on and movable relative to said support, a dressingfixture supported on and movable independent of said wheel, means formoving said wheel, a link system interconnecting the wheel and dresserand so constructed that a movement of the former causes the latter tomove twice the distance thereof.

4. In a grinding machine, in combination, a. bodily movable grindingwheel, a bodily movable trimming device, both 01 which are independentlysupported, and a link system interconnecting said wheel and trimmingdevice and so constructed that movement of the former causes the latterto move twice the distance thereof.

- HENRY Q. MUNN.

